Delete Emails older than X days in Exchange 2003

You could use the tool ExMerge. Here is a decription how to delete messages on the server using that utility:

How do I use EXMERGE to delete specific messages from Exchange 2000/2003 mailboxes?

You can download Exmerge in Microsoft's Download area.

Here is a screenshot of the selection criteria (by date):

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You can use the Mailbox Manager Settings in the Recipient Policies to set a retention limit on email messages.

You can read the steps on how to accomplish this in KB319188.

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